Improvement in lamp-chimneys



w. T. GILLINDER. Lamp Chimney.

Patented Feb. `9, 1869.

4 @ew/57.2%@ 44x/ w@ ma N. PETERS, PHOTOJJTHOGRAFNE WASHINGTON D c. v

ery, gieten intenti @ttbm @QW were WILLIAM T. GILLINDER, orPHILADELPHrA, PENNSYLVANIA, AssIGNOR To HIMSELF AND EDWIN BENNETT, 0F'SAME PLAGE.

Letters .Patent No. 86,660, dated Februa/ry 9, 1869.

IMPROVEMENT I N LAMIP-CEIMNEYS.

The Schedule referred to in these Letters Patent and making part of thesame.'

. To all whom it may camera Be it known that I, WILLIAM T. GILLINDER, ofthe city of Philade1phia,in the State of Pennsylvania, have invented anew and useful Improvement in Glass Chimneys for Lam ps; and I do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation ofthe same, reference being had to theaccompanying drawings, making a part of this specificaf tion, inwhich-'- and durable glass chimney, having in itself a reflector,

the whole of which will serve the double purpose of a reflector and atransmitter of light from the lampilame; and

My invention consists of a .glass chimney, having blown or moulded, as aconstituent of one 0f its sides, a circular' portion, corrugatedradially, and also roughened on its outer side, substantially ashereinafter set forth and described.

Referring to the drawings- A B is a glass chimney, made in the commonform, in which two of its opposite sides are flattened, as requiredforlamps having broad, dat-wick tubes, and

C, the corrugated relector in one of its said flattened sides.

To enable others skilled in the art to which it belongs, to understandand make myinvention, I Will proceed -to describe the mode ofproduction.

The usual mould in which the lattened chimneys are formed has acounterpart of the reflector C, made in one side, and then the whole ofthe said part roughened and perforated with numerous very minute vent-lholes.V

' In producing the improved chimney, the glass is blown, while in a hot,plastic state, in the said mould, so as to cause it to receive thecorrugations, c'vc, required, the roughened surfaces of the same beingat the same time produced on the outer sides only, by the roughenedsurfaces and the minute perforations before mentioned, whilst the innersurfaces remain smooth, or even,l the perforations at the same timeallowing the air to escape, and therefore permitting the full sharpnessand accuracy in the corrugations, as required.

It will therefore be'seen that, as the outer sides of the corrugationsof the reflector G will be roughened, and the inner sides smooth, oreven, as described, it will serve the purpose of transmitting a portionof the light of the iiame outward through it, as Well as the reliectionof light in opposite dilectious by its inner side, and that the cost ofproducing the chimney and reflector will not be appreciably more than alike chimney with out the reflector, while the durability of thesaidrelector will be equal to the chimney itself. 4

I am aware that concentric circular corrugations have been moulded orblown in a glass chimney for a lamp, Y

and that lenses of dilerent forms have also been moulded in glasschimneys for lamps, for the purpose of either diffusing or concentratingthe rays of the light, or both, and therefore I do not desire to claimeither of the said devices as a constituent part of a glass chimney; buthaving thus described my invention,

What I claim as new, and desire to secure 'by Let4 ters Patent, isconfined to the following, viz: lAr glass chimney having the radiatingcorrugations c c', roughened on their outer sides, substantially as andfor the purposes described.

WILLIAM T. GILLINDER. Witnesses:

BENJ. MoRIsoN, WM. H. MomsoN.

